When you work in certain surfaces as illustration board you can use an eraser… Its very helpful to make textures, or correct some sharp details. Anyway there is a bit of stain over the surface when you erase, so for Highlights is maybe better to mask… But you can errase also over-spray… So in the end is a technique you can use when there is the possibility…
Federico Garcia
My Blog
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"...when someone gives a critique of your work, fear not. It usually means they like or care more of your work than when they just pat your back." - Tiago